如何使用STL在C++中查找两个向量之间的公共元素
给定两个向量,在C++中使用STL查找这两个向量之间的公共元素。
示例:
输入:
vec1 = {1, 45, 54, 71, 76, 12},
vec2 = {1, 7, 5, 4, 6, 12}
输出: {1, 12}
输入:
vec1 = {1, 7, 5, 4, 6, 12},
vec2 = {10, 12, 11}
输出: {1, 4, 12}
解决方法:可以使用STL中提供的set_intersection()函数找到公共元素。
语法:
set_intersection (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, InputIterator2 last2,
OutputIterator result);
// C++中使用STL查找两个向量之间的公共元素
#include <bits/stdc++.h>
using namespace std;
int main()
{
// 获取向量
vector<int> vector1 = {1, 45, 54, 71, 76, 12};
vector<int> vector2 = {1, 7, 5, 4, 6, 12};
// 将向量排序
sort(vector1.begin(), vector1.end());
sort(vector2.begin(), vector2.end());
// 输出向量
cout << "First Vector: ";
for (int i = 0; i < vector1.size(); i++)
cout << vector1[i] << " ";
cout << endl;
cout << "Second Vector: ";
for (int i = 0; i < vector2.size(); i++)
cout << vector2[i] << " ";
cout << endl;
// 初始化一个向量,用于存储公共值以及迭代器用于遍历该向量
vector<int> v(vector1.size() + vector2.size());
vector<int>::iterator it, st;
it = set_intersection(vector1.begin(),
vector1.end(),
vector2.begin(),
vector2.end(),
v.begin());
cout << "\nCommon elements:\n";
for (st = v.begin(); st != it; ++st)
cout << *st << ", ";
cout << '\n';
return 0;
}
First Vector: 1 12 45 54 71 76
Second Vector: 1 4 5 6 7 12
公共元素:
1, 12,